In a tidy workshop in San Francisco's Mission District, Joe Hebenstreit is surrounded by a curvy wooden chair, a carbon-fiber drone chassis, a beanbag-toss game, a copper bracelet, a carefully cut slab of kitchen counter top -- and the machine his company used to make all of them. Hebenstreit, formerly the lead design engineer of Google Glass computerized eyewear, now is chief executive of Shaper. The nine-person startup on Monday night began sales of a camera-enhanced, computer-guided cutting tool called the Origin. It tracks its own location so it can handle high-precision positioning as it guides you through a job. "It's like autocorrect for your hands," Hebenstreit said.